Config-driven wallet-connect notice (for the Blockaid false-positive window)

New shared wallet-notice.js on join-now, my, training: if config.walletNotice
is set, shows an admin-authored heads-up right above every connect/unlock
button; empty string hides it everywhere (one PATCH, no deploy). Placed at the
friction point only, not a sitewide banner, so unaffected wallets/Mini App
users are not told about a warning they will never see.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

private/join-now.html

@@ -71,4 +71,4 @@
   <p class="micro" style="text-align:center">No income is guaranteed. Cryptocurrency and smart-contract participation carry risk. Only use funds you can afford to lose.</p>
 </main>
 <footer class="wrap disclaimer">All figures are read live from the RM Circle smart contract on Polygon. Not an earnings guarantee or investment advice. Participation carries risk of loss.<div class="footer-links"><a href="/">Home</a><a href="/training">Training</a><a href="/how-pay-works">How You Get Paid</a><a href="/contract">Contract Security</a><a href="/disclaimer">Disclaimers</a></div></footer>
-<script src="/track.js"></script><script src="/tg-app.js"></script><script src="/rmc-wallet.js"></script><script src="/join-now.js"></script><script src="/translate.js" defer></script></body></html>
+<script src="/track.js"></script><script src="/tg-app.js"></script><script src="/rmc-wallet.js"></script><script src="/join-now.js"></script><script src="/wallet-notice.js" defer></script><script src="/translate.js" defer></script></body></html>